Cleaning or drying compositions based on 43-10mee, on CH2C12, on cyclopentane and on CH3OH

Abstract

In order to replace compositions based on CFC or on HCFC in cleaning or drying applications on solid surfaces (in particular defluxing), the invention provides azeotropic or near-azeotropic compositions based on 1,1,1,2,3,4,4,5,5,5-decafluoropentane, on dichloromethane, on cyclopentane and on methanol.

What is claimed is:  
     
       1. Azeotropic or near-azeotropic compositions comprising: 
       from 35 to 55% of 1,1,1,2,3,4,4,5,5,5-decafluoropentane,  
       from 20 to 40% of dichloromethane,  
       from 10 to 20%, of cyclopentane, and  
       from 0.5 to 10% of methanol.  
     
     
       2. Composition according to claim  1  in the form of an azeotrope, wherein the boiling temperature is 31.4° C. at standard atmospheric pressure. 
     
     
       3. Compositions according to claim  1 , further comprising a stabilizer. 
     
     
       4. Compositions according to claim  1 , further comprising a soluble hydrophobic surfactant. 
     
     
       5. Method for cleaning and degreasing of solid surfaces, including defluxing of printed circuits, and in drying operations on surfaces comprising treating the surface with the composition according to claim  1 . 
     
     
       6. Azeotropic or near-azeotropic compositions according to claim  1 , wherein the amount of decafluoropentane is from 40 to 50%, dichloromethane, is from 25 to 35%, cyclopentane is from 15 to 20%, and methanol is from 1 to 5%. 
     
     
       7. Compositions according to claim  3 , wherein the stabilizer is dimethoxymethane. 
     
     
       8. Compositions according to claim  4 , wherein the surfactant is a diamide of formula: 
       
         
           R—CO—NR—(CH 2 ) n —NH—CO—R  (I)  
         
       
       in which R is a alkyl radical comprising from 14 to 22 carbon atoms, and n is an integer between 1 and 5 inclusive. 
     
     
       9. Compositions according to claim  8 , wherein R contains from 16 to 20 carbon atoms and n is equal to 3.